EP0518791A1 - Electromagnet trip device with percussion-pin - Google Patents

Electromagnet trip device with percussion-pin Download PDF

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Publication number
EP0518791A1
EP0518791A1 EP92420196A EP92420196A EP0518791A1 EP 0518791 A1 EP0518791 A1 EP 0518791A1 EP 92420196 A EP92420196 A EP 92420196A EP 92420196 A EP92420196 A EP 92420196A EP 0518791 A1 EP0518791 A1 EP 0518791A1
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EP
European Patent Office
Prior art keywords
core
trip device
electromagnetic trip
percussion
rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92420196A
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German (de)
French (fr)
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EP0518791B1 (en
Inventor
Alain Frolla
Olivier Dardare
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Schneider Electric SE
Original Assignee
Merlin Gerin SA
Schneider Electric SE
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Publication of EP0518791A1 publication Critical patent/EP0518791A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • the invention relates to an electromagnetic trip device, in particular for a miniature electric circuit breaker, comprising an excitation coil coaxially surrounding an insulating sheath of tubular shape, inside which is slidably mounted a movable ferromagnetic core cooperating with a ferromagnetic core fixed with interposition of an axial air gap, an actuating rod made of insulating material, passing coaxially through a passage orifice formed in the fixed core, and having a first internal end secured to the movable core on the side of the air gap, an external end piece percussion device secured to the second opposite projecting end of the actuating rod, and return means urging the movable core towards a separated position.
  • the transmission of the percussion energy can generate transient mechanical behaviors likely to reduce the output of the trigger.
  • a known trigger comprises an actuating rod snapped onto an attachment point shaped as a protruding boss of the movable core.
  • Such an articulated connection constitutes a ball joint.
  • the axial range of the rod passage orifice is also quite long, for example half the length of the fixed core.
  • the arrangement of such a known trigger can create proper modes of vibration, the first node of which is located approximately at the junction point of the articulation link. The deformation of the rod can interfere with the fixed core, causing mechanical friction and a drop in percussion efficiency.
  • the object of the invention is to improve the efficiency of an electromagnetic trip device with striker for miniature circuit breaker.
  • the trip device according to the invention is characterized in that the first end of the insulating actuating rod is rigidly anchored in a conjugate hole in the movable core to form a built-in mechanical connection.
  • the blind hole is arranged symmetrically with respect to the longitudinal axis.
  • the section of the first end of the insulating rod is frustoconical, or may have any other non-cylindrical shape.
  • the performance of the trigger can be further improved thanks to the annular rim formed in the bore of the fixed core, said rim being shaped as a diaphragm to improve the dynamic behavior of the moving element during the percussion phase following the magnetic attraction of the core movable against the pole surface of the fixed core.
  • the rim has a reduced central span, in particular less than a third of the length of the fixed core.
  • the rim is positioned in the vicinity of the middle of the actuating rod at the time of percussion.
  • an electromagnetic trip device 10 in particular for a control mechanism of a miniature circuit breaker, comprises a magnetic circuit 11 associated with an excitation coil 12 of cylindrical shape mounted coaxially on a tubular insulating sheath 13.
  • the magnetic circuit 11 made of ferromagnetic material comprises a carcass delimited by two lateral flanges 14, 15 framing the sheath 13 in the direction of the longitudinal axis 16. Inside the sheath 13 and the carcass is slidably mounted a movable core or plunger 17 with the formation of a radial clearance 18 relative to the sleeve 13 and to the flange 14, allowing the displacement in axial translation of the core 17 along the longitudinal axis 16.
  • the sleeve 13 serves both as a support means of the coil 12, and of means for axially guiding the plunger core 17.
  • the plunger core 17 cooperates with a fixed core 19 arranged without play inside the sheath 13, and rigidly secured to the flange 15.
  • the plunger core 17 is equipped with a cylindrical actuating rod 20 of insulating material, extending along the longitudinal axis 16 and passing coaxially through an orifice 21 tubular passage formed in the fixed core 19.
  • the projecting end 22 of the rod 20 carries a percussion end piece 23 intended to cooperate firstly with a release lever to ensure the unlocking of the lock, and secondly with the support lever of the arm movable contact, when the current flowing in the coil 12 exceeds the magnetic tripping threshold, causing the attraction of the plunger core 17 against the fixed core 19 (dashed in the figure).
  • the operation of such a trigger is described in detail in the document FR-A-2,641,644.
  • the plunger core 17 is provided with an annular notch 24 for housing a return spring 25, urging the plunger core 17 towards the separated position (in solid lines in the figure).
  • the magnetic triggering threshold of the trigger 10 depends on the preload of the return spring 25 which determines the return force antagonistic to the magnetic attraction force of the movable core 17.
  • the first internal end 26 of the insulating actuating rod 20 is rigidly anchored in a hole 27 conjugated with the ferromagnetic plunger core 17 to form a built-in mechanical connection.
  • the blind hole 27 is located on the side of the fixed core 19, and is arranged symmetrically with respect to the longitudinal axis 16.
  • the internal end 26 of the rod 20 is frustoconical, but may have any other non-cylindrical shape favoring embedding in hole 27.
  • the built-in mechanical connection can be reinforced by adding adhesive inside the hole 27, before the end 26 is introduced.
  • the depth of the hole 27 in the direction of the longitudinal axis 16 extends over a fraction of the axial length of the core plunger 17, in particular greater than 10%.
  • the plunger core 17 and embedded rod 20 assembly forms a rigid monobloc piece made of two different metal - plastic materials. This part constitutes the mobile assembly of the electromagnetic trip device 10.
  • the tubular orifice 21 for the passage of the rod 20 is delimited by an annular rim 28 of the hollow fixed core 19.
  • the diameter of the orifice 21 corresponds to the internal diameter of the rim 28, which is smaller than that of the bore 29 of the fixed core 19.
  • the guide rim 28 in which the actuating rod 20 slides, is arranged in the part intermediate of the bore 29, and has a bearing surface with a reduced axial length, in particular less than a third of that of the fixed core 19.
  • the rim 28 is shaped as a diaphragm located in the vicinity of the neutral of the main mode of vibration so as to reduce the mechanical friction of the actuating rod 20, and to improve the dynamic behavior of the moving element after the effect of the unfavorable modes on percussion.
  • the operation of the electromagnetic trip device 10 according to the invention is as follows: If a short-circuit current appears in the coil 12, the movable core 17 is drawn into the air gap 31 by translation to the right against the pole surface 30 of the fixed core 19.
  • the actuating rod 20 and the percussion endpiece 23 move with the movable core 17 from the inactive position (in solid lines) to the active position (in dotted lines), causing the triggering of the mechanism, and an effect of percussion causing the forced opening of the moving contact of the circuit breaker.
  • the shock generated by the magnetic attraction of the mobile core 17 is transmitted to the rod actuator 20 made of plastic material.
  • the rigid embedding of the end 26 of the rod 20 in the conjugate hole 27 of the movable core 17 prevents any buckling of the rod 20 and modifies the distribution of the natural modes of vibration following the axial shift from the middle of the rod 20 towards the built-in connection. Percussion occurs when a portion of the rod 20, in particular less than half the axial length, is released from the fixed core 19. The percussion is then in good performance conditions for the transmission of energy from the core mobile 17 to the mobile contact.
  • the second criterion for improving the efficiency of the energy transmission results from the presence of the diaphragm-shaped rim 28 having a reduced axial range.
  • the provision of a diaphragm in place of a longer reach in the fixed core 19 allows a significant reduction in friction of the actuating rod 20, and the elimination of unfavorable modes of vibration on percussion.
  • the fixed core 19 then plays the role of node selector.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Electric Clocks (AREA)

Abstract

The invention relates to an electromagnetic trip device with percussion pin. The insulating actuation rod (20) of the percussion pin is anchored rigidly in a hole (27) conjugate with the ferromagnetic mobile core (17) to form a built-in connection. The rod (20) traverses a through-orifice (21) in a diaphragm (28) disposed in the bore (29) of the fixed core (19) in order to improve the dynamic behaviour during percussion. Applications: miniature electric circuit breakers. <IMAGE>

Description

L'invention est relative à un déclencheur électromagnétique, notamment pour un disjoncteur électrique miniature, comprenant une bobine d'excitation entourant coaxialement un fourreau isolant de forme tubulaire, à l'intérieur duquel est monté à coulissement un noyau ferromagnétique mobile coopérant avec un noyau ferromagnétique fixe avec interposition d'un entrefer axial, une tige d'actionnement en matériau isolant, traversant coaxialement un orifice de passage ménagé dans le noyau fixe, et ayant une première extrémité interne solidarisée au noyau mobile du côté de l'entrefer, un embout externe de percussion assujetti à la deuxième extrémité saillante opposée de la tige d'actionnement, et des moyens de rappel sollicitant le noyau mobile vers une position écartée.The invention relates to an electromagnetic trip device, in particular for a miniature electric circuit breaker, comprising an excitation coil coaxially surrounding an insulating sheath of tubular shape, inside which is slidably mounted a movable ferromagnetic core cooperating with a ferromagnetic core fixed with interposition of an axial air gap, an actuating rod made of insulating material, passing coaxially through a passage orifice formed in the fixed core, and having a first internal end secured to the movable core on the side of the air gap, an external end piece percussion device secured to the second opposite projecting end of the actuating rod, and return means urging the movable core towards a separated position.

En cas d'intervention d'un déclencheur électromagnétique en présence d'un courant de court-circuit ou de surcharge, le mécanisme déclenche, et les contacts s'ouvrent par percussion de la tige d'actionnement du noyau mobile. L'énergie cinétique accumulée par le noyau mobile lors de l'attraction magnétique est ainsi transmise à l'équipage mobile du disjoncteur pour provoquer l'ouverture forcée des contacts.In the event of an electromagnetic trip device intervening in the presence of a short-circuit or overload current, the mechanism trips, and the contacts open by percussion of the actuating rod of the movable core. The kinetic energy accumulated by the mobile core during magnetic attraction is thus transmitted to the mobile equipment of the circuit breaker to cause the forced opening of the contacts.

La transmission de l'énergie de percussion peut engendrer des comportements mécaniques transitoires susceptibles de réduire le rendement du déclencheur.The transmission of the percussion energy can generate transient mechanical behaviors likely to reduce the output of the trigger.

Un déclencheur connu comporte une tige d'actionnement encliquetée sur un point d'attache conformé en bossage saillant du noyau mobile. Une telle liaison articulée constitue une rotule. La portée axiale de l'orifice de passage de la tige est d'autre part assez longue, par exemple la moitié de la longueur du noyau fixe. En cas de percussion, l'agencement d'un tel déclencheur connu peut créer des modes propres de vibration dont le premier noeud se trouve approximativement au point de jonction de la liaison à articulation. La déformation de la tige peut interférer avec le noyau fixe, provoquant des frottements mécaniques et une chute de rendement de percussion.A known trigger comprises an actuating rod snapped onto an attachment point shaped as a protruding boss of the movable core. Such an articulated connection constitutes a ball joint. The axial range of the rod passage orifice is also quite long, for example half the length of the fixed core. In the event of percussion, the arrangement of such a known trigger can create proper modes of vibration, the first node of which is located approximately at the junction point of the articulation link. The deformation of the rod can interfere with the fixed core, causing mechanical friction and a drop in percussion efficiency.

Le rendement chute d'autant plus que la partie saillante de la tige du percuteur se trouve dégagée du noyau fixe au-delà de sa moitié, et que l'entrefer résiduel est grand au moment du choc.The yield drops all the more since the projecting part of the striker rod is released from the fixed core beyond its half, and the residual air gap is large at the time of the impact.

L'objet de l'invention consiste à améliorer le rendement d'un déclencheur électromagnétique à percuteur pour disjoncteur miniature.The object of the invention is to improve the efficiency of an electromagnetic trip device with striker for miniature circuit breaker.

Le déclencheur selon l'invention est caractérisé en ce que la première extrémité de la tige d'actionnement isolante est ancrée rigidement dans un trou conjugué du noyau mobile pour former une liaison mécanique à encastrement.The trip device according to the invention is characterized in that the first end of the insulating actuating rod is rigidly anchored in a conjugate hole in the movable core to form a built-in mechanical connection.

Le trou borgne est agencé symétriquement par rapport à l'axe longitudinal. La section de la première extrémité de la tige isolante est tronconique, ou peut avoir tout autre forme non cylindrique.The blind hole is arranged symmetrically with respect to the longitudinal axis. The section of the first end of the insulating rod is frustoconical, or may have any other non-cylindrical shape.

Tout flambage de la tige isolante est évité par la présence de l'encastrement rigide, et la percussion intervient lorsqu'une portion minimale de la tige est dégagée du noyau fixe.Any buckling of the insulating rod is avoided by the presence of rigid embedding, and percussion occurs when a minimum portion of the rod is released from the fixed core.

Le rendement du déclencheur peut encore être amélioré grâce au rebord annulaire ménagé dans l'alésage du noyau fixe, ledit rebord étant conformé en diaphragme pour améliorer le comportement dynamique de l'équipage mobile lors de la phase de percussion suite à l'attraction magnétique du noyau mobile contre la surface polaire du noyau fixe.The performance of the trigger can be further improved thanks to the annular rim formed in the bore of the fixed core, said rim being shaped as a diaphragm to improve the dynamic behavior of the moving element during the percussion phase following the magnetic attraction of the core movable against the pole surface of the fixed core.

Le rebord présente une portée centrale réduite, notamment inférieure au tiers de la longueur du noyau fixe.The rim has a reduced central span, in particular less than a third of the length of the fixed core.

Le rebord est positionné au voisinage du milieu de la tige d'actionnement au moment de la percussion.The rim is positioned in the vicinity of the middle of the actuating rod at the time of percussion.

Il en résulte une réduction des frottements mécaniques de la tige, et une suppression des modes défavorables de vibration sur la percussion.This results in a reduction of the mechanical friction of the rod, and a suppression of the unfavorable modes of vibration on the percussion.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention, donné à titre d'exemple non limitatif, et représenté au dessin annexé, avec une vue schématique en coupe axiale d'un déclencheur électromagnétique illustré en position inactive (traits pleins), et en position active (traits en pointillés).Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of nonlimiting example, and represented in the appended drawing, with a schematic view in axial section of an electromagnetic trip device illustrated in the inactive position (solid lines), and in the active position (dotted lines).

Sur la figure, un déclencheur électromagnétique 10, notamment pour un mécanisme de commande d'un disjoncteur miniature, comporte un circuit magnétique 11 associé à une bobine 12 d'excitation de forme cylindrique montée coaxialement sur un fourreau 13 isolant tubulaire.In the figure, an electromagnetic trip device 10, in particular for a control mechanism of a miniature circuit breaker, comprises a magnetic circuit 11 associated with an excitation coil 12 of cylindrical shape mounted coaxially on a tubular insulating sheath 13.

Le circuit magnétique 11 en matériau ferromagnétique comprend une carcasse délimitée par deux flasques 14,15 latéraux encadrant le fourreau 13 dans la direction de l'axe longitudinal 16. A l'intérieur du fourreau 13 et de la carcasse est monté à coulissement un noyau mobile ou plongeur 17 avec formation d'un jeu 18 radial par rapport au fourreau 13 et au flasque 14, autorisant le déplacement en translation axiale du noyau 17 le long de l'axe longitudinal 16. Le fourreau 13 sert à la fois de moyen de support de la bobine 12, et de moyen de guidage axial du noyau plongeur 17.The magnetic circuit 11 made of ferromagnetic material comprises a carcass delimited by two lateral flanges 14, 15 framing the sheath 13 in the direction of the longitudinal axis 16. Inside the sheath 13 and the carcass is slidably mounted a movable core or plunger 17 with the formation of a radial clearance 18 relative to the sleeve 13 and to the flange 14, allowing the displacement in axial translation of the core 17 along the longitudinal axis 16. The sleeve 13 serves both as a support means of the coil 12, and of means for axially guiding the plunger core 17.

Le noyau plongeur 17 coopère avec un noyau fixe 19 agencé sans jeu à l'intérieur du fourreau 13, et solidarisé rigidement au flasque 15.The plunger core 17 cooperates with a fixed core 19 arranged without play inside the sheath 13, and rigidly secured to the flange 15.

Le noyau plongeur 17 est équipé d'une tige d'actionnement 20 cylindrique en matériau isolant, s'étendant le long de l'axe longitudinal 16 et traversant coaxialement un orifice 21 tubulaire de passage ménagé dans le noyau fixe 19. L'extrémité saillante 22 de la tige 20 porte un embout 23 de percussion destiné à coopérer premièrement avec un levier de déclenchement pour assurer le déverrouillage du verrou, et deuxièmement avec le levier support du bras de contact mobile, lorsque le courant circulant dans la bobine 12 dépasse le seuil de déclenchement magnétique, provoquant l'attraction du noyau plongeur 17 contre le noyau fixe 19 (en pointillé sur la figure). Le fonctionnement d'un tel déclencheur est décrit en détail dans le document FR-A-2.641.644.The plunger core 17 is equipped with a cylindrical actuating rod 20 of insulating material, extending along the longitudinal axis 16 and passing coaxially through an orifice 21 tubular passage formed in the fixed core 19. The projecting end 22 of the rod 20 carries a percussion end piece 23 intended to cooperate firstly with a release lever to ensure the unlocking of the lock, and secondly with the support lever of the arm movable contact, when the current flowing in the coil 12 exceeds the magnetic tripping threshold, causing the attraction of the plunger core 17 against the fixed core 19 (dashed in the figure). The operation of such a trigger is described in detail in the document FR-A-2,641,644.

A l'opposé de la tige 20, le noyau plongeur 17 est doté d'une encoche 24 annulaire de logement d'un ressort de rappel 25, sollicitant le noyau plongeur 17 vers la position écartée (en traits pleins sur la figure). Le seuil de déclenchement magnétique du déclencheur 10 dépend de la précontrainte du ressort de rappel 25 qui détermine la force de rappel antagoniste à la force d'attraction magnétique du noyau mobile 17.Opposite the rod 20, the plunger core 17 is provided with an annular notch 24 for housing a return spring 25, urging the plunger core 17 towards the separated position (in solid lines in the figure). The magnetic triggering threshold of the trigger 10 depends on the preload of the return spring 25 which determines the return force antagonistic to the magnetic attraction force of the movable core 17.

A l'opposé de l'embout 23 de percussion, la première extrémité interne 26 de la tige d'actionnement 20 isolante est ancrée rigidement dans un trou 27 conjugué du noyau plongeur 17 ferromagnétique pour former une liaison mécanique à encastrement.Opposite the percussion end piece 23, the first internal end 26 of the insulating actuating rod 20 is rigidly anchored in a hole 27 conjugated with the ferromagnetic plunger core 17 to form a built-in mechanical connection.

Le trou 27 borgne est situé du côté du noyau fixe 19, et est agencé symétriquement par rapport à l'axe longitudinal 16. L'extrémité interne 26 de la tige 20 est tronconique, mais peut présenter tout autre forme non cylindrique favorisant l'encastrement dans le trou 27.The blind hole 27 is located on the side of the fixed core 19, and is arranged symmetrically with respect to the longitudinal axis 16. The internal end 26 of the rod 20 is frustoconical, but may have any other non-cylindrical shape favoring embedding in hole 27.

La liaison mécanique à encastrement peut être renforcée par un apport de colle à l'intérieur du trou 27, avant introduction de l'extrémité 26.The built-in mechanical connection can be reinforced by adding adhesive inside the hole 27, before the end 26 is introduced.

La profondeur du trou 27 dans la direction de l'axe longitudinal 16 s'étend sur une fraction de la longueur axiale du noyau plongeur 17, notamment supérieure à 10%.The depth of the hole 27 in the direction of the longitudinal axis 16 extends over a fraction of the axial length of the core plunger 17, in particular greater than 10%.

Après montage, l'ensemble noyau plongeur 17 et tige 20 encastrée forme une pièce monobloc rigide réalisée en deux matériaux différents métal - plastique. Cette pièce constitue l'équipage mobile du déclencheur électomagnétique 10.After assembly, the plunger core 17 and embedded rod 20 assembly forms a rigid monobloc piece made of two different metal - plastic materials. This part constitutes the mobile assembly of the electromagnetic trip device 10.

L'orifice 21 tubulaire de passage de la tige 20 est délimité par un rebord 28 annulaire du noyau fixe 19 creux. Le diamètre de l'orifice 21 correspond au diamètre interne du rebord 28, lequel est inférieur à celui de l'alésage 29 du noyau fixe 19. Le rebord 28 de guidage dans lequel coulisse la tige d'actionnement 20, est agencé dans la partie intermédiaire de l'alésage 29, et présente une portée ayant une longueur axiale réduite, notamment inférieure au tiers de celle du noyau fixe 19.The tubular orifice 21 for the passage of the rod 20 is delimited by an annular rim 28 of the hollow fixed core 19. The diameter of the orifice 21 corresponds to the internal diameter of the rim 28, which is smaller than that of the bore 29 of the fixed core 19. The guide rim 28 in which the actuating rod 20 slides, is arranged in the part intermediate of the bore 29, and has a bearing surface with a reduced axial length, in particular less than a third of that of the fixed core 19.

Le rebord 28 est conformé en diaphragme localisé au voisinage du neutre du mode principal de vibration de manière à réduire les frottements mécaniques de la tige d'actionnement 20, et à améliorer le comportement dynamique de l'équipage mobile après suppression de l'effet des modes défavorables sur la percussion.The rim 28 is shaped as a diaphragm located in the vicinity of the neutral of the main mode of vibration so as to reduce the mechanical friction of the actuating rod 20, and to improve the dynamic behavior of the moving element after the effect of the unfavorable modes on percussion.

Le fonctionnement du déclencheur électromagnétique 10 selon l'invention est le suivant:
   En cas d'apparition d'un courant de court-circuit dans la bobine 12, le noyau mobile 17 est attiré dans l'entrefer 31 par translation vers la droite contre la surface polaire 30 du noyau fixe 19.The operation of the electromagnetic trip device 10 according to the invention is as follows:
If a short-circuit current appears in the coil 12, the movable core 17 is drawn into the air gap 31 by translation to the right against the pole surface 30 of the fixed core 19.

La tige d'actionnement 20 et l'embout 23 de percussion se déplacent avec le noyau mobile 17 de la position inactive (en traits pleins) jusqu'à la position active (en traits pointillés), provoquant le déclenchement du mécanisme, et un effet de percussion entraînant l'ouverture forcée du contact mobile du disjoncteur. Le choc engendré par l'attraction magnétique du noyau mobile 17 est transmis à la tige d'actionnement 20 en matériau plastique.The actuating rod 20 and the percussion endpiece 23 move with the movable core 17 from the inactive position (in solid lines) to the active position (in dotted lines), causing the triggering of the mechanism, and an effect of percussion causing the forced opening of the moving contact of the circuit breaker. The shock generated by the magnetic attraction of the mobile core 17 is transmitted to the rod actuator 20 made of plastic material.

L'encastrement rigide de l'extrémité 26 de la tige 20 dans le trou 27 conjugué du noyau mobile 17 évite tout flambage de la tige 20 et modifie la répartition des modes propres de vibration suite au décalage axial du milieu de la tige 20 vers la liaison à encastrement. La percussion intervient lorsqu'une portion de la tige 20, notamment inférieure à la moitié de la longueur axiale, est dégagée du noyau fixe 19. La percussion se trouve alors dans de bonnes conditions de rendement pour la transmission de l'énergie depuis le noyau mobile 17 jusqu'au contact mobile.The rigid embedding of the end 26 of the rod 20 in the conjugate hole 27 of the movable core 17 prevents any buckling of the rod 20 and modifies the distribution of the natural modes of vibration following the axial shift from the middle of the rod 20 towards the built-in connection. Percussion occurs when a portion of the rod 20, in particular less than half the axial length, is released from the fixed core 19. The percussion is then in good performance conditions for the transmission of energy from the core mobile 17 to the mobile contact.

Le deuxième critère d'amélioration du rendement de la transmission d'énergie résulte de la présence du rebord 28 en forme de diaphragme ayant une portée axiale réduite. La disposition d'un diaphragme à la place d'une portée plus longue dans le noyau fixe 19 permet une réduction notable des frottements de la tige d'actionnement 20, et la suppression des modes défavorables de vibration sur la percussion. Le noyau fixe 19 joue alors le rôle de sélecteur de noeud.The second criterion for improving the efficiency of the energy transmission results from the presence of the diaphragm-shaped rim 28 having a reduced axial range. The provision of a diaphragm in place of a longer reach in the fixed core 19 allows a significant reduction in friction of the actuating rod 20, and the elimination of unfavorable modes of vibration on percussion. The fixed core 19 then plays the role of node selector.

L'addition des deux critères précités, à savoir l'encastrement rigide de la tige 20 en matériau plastique dans le noyau mobile, et la disposition du diaphragme 28 du noyau fixe 19 par rapport à la tige 20 lors de la percussion, permet d'obtenir un rendement optimum du déclencheur 10 pour la transmission d'énergie depuis le noyau mobile 17 jusqu'au contact mobile.The addition of the two aforementioned criteria, namely the rigid embedding of the rod 20 of plastic material in the movable core, and the arrangement of the diaphragm 28 of the fixed core 19 relative to the rod 20 during percussion, makes it possible to obtain optimum efficiency of the trigger 10 for the transmission of energy from the movable core 17 to the movable contact.

Claims (8)

Déclencheur électromagnétique, notamment pour un disjoncteur électrique miniature, comprenant une bobine (12) d'excitation entourant coaxialement un fourreau (13) isolant de forme tubulaire, à l'intérieur duquel est monté à coulissement un noyau ferromagnétique mobile (17) coopérant avec un noyau ferromagnétique fixe (19) avec interposition d'un entrefer (31) axial, une tige d'actionnement (20) en matériau isolant, traversant coaxialement un orifice (21) de passage ménagé dans le noyau fixe (19), et ayant une première extrémité interne (26) solidarisée au noyau mobile (17) du côté de l'entrefer (31), un embout (23) externe de percussion assujetti à la deuxième extrémité saillante (22) opposée de la tige d'actionnement (20), et des moyens de rappel (25) sollicitant le noyau mobile (17) vers une position écartée,
caractérisé en ce que la première extrémité (26) de la tige d'actionnement (20) isolante est ancrée rigidement dans un trou (27) conjugué du noyau mobile (17) pour former une liaison mécanique à encastrement.Electromagnetic trip device, in particular for a miniature electric circuit breaker, comprising an excitation coil (12) coaxially surrounding an insulating sheath (13) of tubular shape, inside of which is slidably mounted a movable ferromagnetic core (17) cooperating with a fixed ferromagnetic core (19) with interposition of an axial air gap (31), an actuating rod (20) made of insulating material, passing coaxially through an orifice (21) for passage formed in the fixed core (19), and having a first internal end (26) secured to the movable core (17) on the side of the air gap (31), an external percussion end piece (23) secured to the second projecting end (22) opposite the actuating rod (20) , and return means (25) urging the movable core (17) towards a separated position,
characterized in that the first end (26) of the insulating actuating rod (20) is rigidly anchored in a hole (27) conjugated with the movable core (17) to form a built-in mechanical connection. Déclencheur électromagnétique selon la revendication 1, caractérisé en ce que le trou (27) borgne est agencé symétriquement par rapport à l'axe longitudinal (16), et que la première extrémité (26) de la tige (20) présente une section non cylindrique.Electromagnetic trip device according to claim 1, characterized in that the blind hole (27) is arranged symmetrically with respect to the longitudinal axis (16), and that the first end (26) of the rod (20) has a non-cylindrical section . Déclencheur électromagnétique selon la revendication 2, caractérisé en ce que la section de la première extrémité (26) est tronconique.Electromagnetic trip device according to claim 2, characterized in that the section of the first end (26) is frustoconical. Déclencheur électromagnétique selon la revendication 3, caractérisé en ce que la liaison mécanique à encastrement est renforcée par un apport de colle à l'intérieur du trou (27) avant introduction de la première extrémité (26) de la tige (20).Electromagnetic trip device according to claim 3, characterized in that the built-in mechanical connection is reinforced by a supply of adhesive inside the hole (27) before introduction of the first end (26) of the rod (20). Déclencheur électromagnétique selon l'une des revendications 1 à 4, caractérisé en ce que la profondeur du trou (27) dans la direction de l'axe longitudinal (16) s'étend sur une fraction de la longueur axiale du noyau mobile (17), notamment supérieure à 10%.Electromagnetic trip device according to one of the claims 1 to 4, characterized in that the depth of the hole (27) in the direction of the longitudinal axis (16) extends over a fraction of the axial length of the movable core (17), in particular greater than 10%. Déclencheur électromagnétique selon l'une des revendications 1 à 5, caractérisé en ce que l'orifice (21) de passage de la tige d'actionnement (20) est délimité par un rebord (28) annulaire ménagé dans l'alésage (29) du noyau fixe (19), ledit rebord (28) étant conformé en diaphragme pour améliorer le comportement dynamique de l'équipage mobile lors de la phase de percussion suite à l'attraction magnétique du noyau mobile (17) contre la surface polaire (30) du noyau fixe (19).Electromagnetic trip device according to one of claims 1 to 5, characterized in that the orifice (21) for the passage of the actuating rod (20) is delimited by an annular flange (28) formed in the bore (29) of the fixed core (19), said rim (28) being shaped as a diaphragm to improve the dynamic behavior of the moving element during the percussion phase following the magnetic attraction of the moving core (17) against the pole surface (30 ) of the fixed core (19). Déclencheur électromagnétique selon la revendication 6, caractérisé en ce que le rebord (28) présente une portée centrale réduite, notamment inférieure au tiers de la longueur du noyau fixe (19).Electromagnetic trip device according to claim 6, characterized in that the flange (28) has a reduced central range, in particular less than a third of the length of the fixed core (19). Déclencheur électromagnétique selon la revendication 6 ou 7, caractérisé en ce que le rebord (28) est positionné au voisinage du milieu de la tige d'actionnement (20) au moment de la percussion.Electromagnetic trip device according to claim 6 or 7, characterized in that the flange (28) is positioned in the vicinity of the middle of the actuating rod (20) at the time of percussion.
EP19920420196 1991-06-14 1992-06-10 Electromagnet trip device with percussion-pin Expired - Lifetime EP0518791B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9107405 1991-06-14
FR9107405A FR2677807B1 (en) 1991-06-14 1991-06-14 ELECTROMAGNETIC TRIGGER WITH PERCUTOR.

Publications (2)

Publication Number Publication Date
EP0518791A1 true EP0518791A1 (en) 1992-12-16
EP0518791B1 EP0518791B1 (en) 1996-03-20

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ID=9413935

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Application Number Title Priority Date Filing Date
EP19920420196 Expired - Lifetime EP0518791B1 (en) 1991-06-14 1992-06-10 Electromagnet trip device with percussion-pin

Country Status (4)

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EP (1) EP0518791B1 (en)
DE (1) DE69209155T2 (en)
ES (1) ES2086702T3 (en)
FR (1) FR2677807B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0978858A2 (en) * 1998-08-04 2000-02-09 Hitachi, Ltd. Circuit breaker
CN104681369A (en) * 2015-02-10 2015-06-03 浙江正泰电器股份有限公司 Electronic leakage protection switch tripping device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7111834U (en) * 1971-03-29 1971-06-16 Bbc Ag
US3704435A (en) * 1971-12-20 1972-11-28 Ite Imperial Corp Tripping system for circuit breaker
EP0351724A2 (en) * 1988-07-20 1990-01-24 Asea Brown Boveri Aktiengesellschaft Electric power circuit breaker
EP0378030A1 (en) * 1989-01-11 1990-07-18 Merlin Gerin Inviolable regulating device for an electrical apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7111834U (en) * 1971-03-29 1971-06-16 Bbc Ag
US3704435A (en) * 1971-12-20 1972-11-28 Ite Imperial Corp Tripping system for circuit breaker
EP0351724A2 (en) * 1988-07-20 1990-01-24 Asea Brown Boveri Aktiengesellschaft Electric power circuit breaker
EP0378030A1 (en) * 1989-01-11 1990-07-18 Merlin Gerin Inviolable regulating device for an electrical apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0978858A2 (en) * 1998-08-04 2000-02-09 Hitachi, Ltd. Circuit breaker
EP0978858A3 (en) * 1998-08-04 2000-10-25 Hitachi, Ltd. Circuit breaker
CN104681369A (en) * 2015-02-10 2015-06-03 浙江正泰电器股份有限公司 Electronic leakage protection switch tripping device

Also Published As

Publication number Publication date
ES2086702T3 (en) 1996-07-01
FR2677807A1 (en) 1992-12-18
EP0518791B1 (en) 1996-03-20
FR2677807B1 (en) 1993-09-03
DE69209155D1 (en) 1996-04-25
DE69209155T2 (en) 1996-10-02

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